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Added in API level 1

android.widget

The widget package contains (mostly visual) UI elements to use on your Application screen. You can also design your own.

To create your own widget, extend View or a subclass. To use your widget in layout XML, there are two additional files for you to create. Here is a list of files you'll need to create to implement a custom widget:

Java implementation file - This is the file that implements the behavior of the widget. If you can instantiate the object from layout XML, you will also have to code a constructor that retrieves all the attribute values from the layout XML file.
XML definition file - An XML file in res/values/ that defines the XML element used to instantiate your widget, and the attributes that it supports. Other applications will use this element and attributes in their in another in their layout XML.
Layout XML [optional]- An optional XML file inside res/layout/ that describes the layout of your widget. You could also do this in code in your Java file.

ApiDemos sample application has an example of creating a custom layout XML tag, LabelView. See the following files that demonstrate implementing and using a custom widget:

LabelView.java - The implementation file
res/values/attrs.xml - Definition file
res/layout/custom_view_1.xml - Layout file

Annotations

RemoteViews.RemoteView This annotation indicates that a subclass of View is alllowed to be used with the RemoteViews mechanism.

Interfaces

AbsListView.MultiChoiceModeListener	A MultiChoiceModeListener receives events for `CHOICE_MODE_MULTIPLE_MODAL`.
AbsListView.OnScrollListener	Interface definition for a callback to be invoked when the list or grid has been scrolled.
AbsListView.RecyclerListener	A RecyclerListener is used to receive a notification whenever a View is placed inside the RecycleBin's scrap heap.
AbsListView.SelectionBoundsAdjuster	The top-level view of a list item can implement this interface to allow itself to modify the bounds of the selection shown for that item.
ActionMenuView.OnMenuItemClickListener	Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners.
Adapter	An Adapter object acts as a bridge between an `AdapterView` and the underlying data for that view.
AdapterView.OnItemClickListener	Interface definition for a callback to be invoked when an item in this AdapterView has been clicked.
AdapterView.OnItemLongClickListener	Interface definition for a callback to be invoked when an item in this view has been clicked and held.
AdapterView.OnItemSelectedListener	Interface definition for a callback to be invoked when an item in this view has been selected.
Advanceable	This interface can be implemented by any collection-type view which has a notion of progressing through its set of children.
AutoCompleteTextView.OnDismissListener	Listener to respond to the AutoCompleteTextView's completion list being dismissed.
AutoCompleteTextView.Validator	This interface is used to make sure that the text entered in this TextView complies to a certain format.
CalendarView.OnDateChangeListener	The callback used to indicate the user changes the date.
Checkable	Defines an extension for views that make them checkable.
Chronometer.OnChronometerTickListener	A callback that notifies when the chronometer has incremented on its own.
CompoundButton.OnCheckedChangeListener	Interface definition for a callback to be invoked when the checked state of a compound button changed.
DatePicker.OnDateChangedListener	The callback used to indicate the user changed the date.
ExpandableListAdapter	An adapter that links a `ExpandableListView` with the underlying data.
ExpandableListView.OnChildClickListener	Interface definition for a callback to be invoked when a child in this expandable list has been clicked.
ExpandableListView.OnGroupClickListener	Interface definition for a callback to be invoked when a group in this expandable list has been clicked.
ExpandableListView.OnGroupCollapseListener	Used for being notified when a group is collapsed
ExpandableListView.OnGroupExpandListener	Used for being notified when a group is expanded
Filter.FilterListener	Listener used to receive a notification upon completion of a filtering operation.
Filterable	Defines a filterable behavior.
FilterQueryProvider	This class can be used by external clients of CursorAdapter and CursorTreeAdapter to define how the content of the adapter should be filtered.
HeterogeneousExpandableList	Additional methods that when implemented make an `ExpandableListAdapter` take advantage of the `Adapter` view type mechanism.
ListAdapter	Extended `Adapter` that is the bridge between a `ListView` and the data that backs the list.
MediaController.MediaPlayerControl
MultiAutoCompleteTextView.Tokenizer
NumberPicker.Formatter	Interface used to format current value into a string for presentation.
NumberPicker.OnScrollListener	Interface to listen for the picker scroll state.
NumberPicker.OnValueChangeListener	Interface to listen for changes of the current value.
PopupMenu.OnDismissListener	Callback interface used to notify the application that the menu has closed.
PopupMenu.OnMenuItemClickListener	Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners.
PopupWindow.OnDismissListener	Listener that is called when this popup window is dismissed.
RadioGroup.OnCheckedChangeListener	Interface definition for a callback to be invoked when the checked radio button changed in this group.
RatingBar.OnRatingBarChangeListener	A callback that notifies clients when the rating has been changed.
RemoteViewsService.RemoteViewsFactory	An interface for an adapter between a remote collection view (ListView, GridView, etc) and the underlying data for that view.
SearchView.OnCloseListener
SearchView.OnQueryTextListener	Callbacks for changes to the query text.
SearchView.OnSuggestionListener	Callback interface for selection events on suggestions.
SectionIndexer	Interface that may implemented on `Adapter`s to enable fast scrolling between sections of an `AbsListView`.
SeekBar.OnSeekBarChangeListener	A callback that notifies clients when the progress level has been changed.
ShareActionProvider.OnShareTargetSelectedListener	Listener for the event of selecting a share target.
SimpleAdapter.ViewBinder	This class can be used by external clients of SimpleAdapter to bind values to views.
SimpleCursorAdapter.CursorToStringConverter	This class can be used by external clients of SimpleCursorAdapter to define how the Cursor should be converted to a String.
SimpleCursorAdapter.ViewBinder	This class can be used by external clients of SimpleCursorAdapter to bind values fom the Cursor to views.
SimpleCursorTreeAdapter.ViewBinder	This class can be used by external clients of SimpleCursorTreeAdapter to bind values from the Cursor to views.
SlidingDrawer.OnDrawerCloseListener	Callback invoked when the drawer is closed.
SlidingDrawer.OnDrawerOpenListener	Callback invoked when the drawer is opened.
SlidingDrawer.OnDrawerScrollListener	Callback invoked when the drawer is scrolled.
SpinnerAdapter	Extended `Adapter` that is the bridge between a `Spinner` and its data.
TabHost.OnTabChangeListener	Interface definition for a callback to be invoked when tab changed
TabHost.TabContentFactory	Makes the content of a tab when it is selected.
TextView.OnEditorActionListener	Interface definition for a callback to be invoked when an action is performed on the editor.
ThemedSpinnerAdapter	An extension of SpinnerAdapter that is capable of inflating drop-down views against a different theme than normal views.
TimePicker.OnTimeChangedListener	The callback interface used to indicate the time has been adjusted.
Toolbar.OnMenuItemClickListener	Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners.
ViewSwitcher.ViewFactory	Creates views in a ViewSwitcher.
WrapperListAdapter	List adapter that wraps another list adapter.
ZoomButtonsController.OnZoomListener	Interface that will be called when the user performs an interaction that triggers some action, for example zooming.

Classes

AbsListView	Base class that can be used to implement virtualized lists of items.
AbsListView.LayoutParams	AbsListView extends LayoutParams to provide a place to hold the view type.
AbsoluteLayout	This class was deprecated in API level 3. Use `FrameLayout`, `RelativeLayout` or a custom layout instead.
AbsoluteLayout.LayoutParams	Per-child layout information associated with AbsoluteLayout.
AbsSeekBar
AbsSpinner	An abstract base class for spinner widgets.
ActionMenuView	ActionMenuView is a presentation of a series of menu options as a View.
ActionMenuView.LayoutParams
AdapterView<T extends Adapter>	An AdapterView is a view whose children are determined by an `Adapter`.
AdapterView.AdapterContextMenuInfo	Extra menu information provided to the `onCreateContextMenu(ContextMenu, View, ContextMenuInfo)` callback when a context menu is brought up for this AdapterView.
AdapterViewAnimator	Base class for a `AdapterView` that will perform animations when switching between its views.
AdapterViewFlipper	Simple `ViewAnimator` that will animate between two or more views that have been added to it.
AlphabetIndexer	A helper class for adapters that implement the SectionIndexer interface.
AnalogClock	This class was deprecated in API level 23. This widget is no longer supported.
ArrayAdapter<T>	A concrete BaseAdapter that is backed by an array of arbitrary objects.
AutoCompleteTextView	An editable text view that shows completion suggestions automatically while the user is typing.
BaseAdapter	Common base class of common implementation for an `Adapter` that can be used in both `ListView` (by implementing the specialized `ListAdapter` interface) and `Spinner` (by implementing the specialized `SpinnerAdapter` interface).
BaseExpandableListAdapter	Base class for a `ExpandableListAdapter` used to provide data and Views from some data to an expandable list view.
Button	Represents a push-button widget.
CalendarView	This class is a calendar widget for displaying and selecting dates.
CheckBox	A checkbox is a specific type of two-states button that can be either checked or unchecked.
CheckedTextView	An extension to `TextView` that supports the `Checkable` interface and displays.
Chronometer	Class that implements a simple timer.
CompoundButton	A button with two states, checked and unchecked.
CursorAdapter	Adapter that exposes data from a `Cursor` to a `ListView` widget.
CursorTreeAdapter	An adapter that exposes data from a series of `Cursor`s to an `ExpandableListView` widget.
DatePicker	Provides a widget for selecting a date.
DialerFilter
DigitalClock	This class was deprecated in API level 17. It is recommended you use `TextClock` instead.
EdgeEffect	This class performs the graphical effect used at the edges of scrollable widgets when the user scrolls beyond the content bounds in 2D space.
EditText	EditText is a thin veneer over TextView that configures itself to be editable.
ExpandableListView	A view that shows items in a vertically scrolling two-level list.
ExpandableListView.ExpandableListContextMenuInfo	Extra menu information specific to an `ExpandableListView` provided to the `onCreateContextMenu(ContextMenu, View, ContextMenuInfo)` callback when a context menu is brought up for this AdapterView.
Filter	A filter constrains data with a filtering pattern.
Filter.FilterResults	Holds the results of a filtering operation.
FrameLayout	FrameLayout is designed to block out an area on the screen to display a single item.
FrameLayout.LayoutParams	Per-child layout information for layouts that support margins.
Gallery	This class was deprecated in API level 16. This widget is no longer supported. Other horizontally scrolling widgets include `HorizontalScrollView` and `ViewPager` from the support library.
Gallery.LayoutParams	Gallery extends LayoutParams to provide a place to hold current Transformation information along with previous position/transformation info.
GridLayout	A layout that places its children in a rectangular grid.
GridLayout.Alignment	Alignments specify where a view should be placed within a cell group and what size it should be.
GridLayout.LayoutParams	Layout information associated with each of the children of a GridLayout.
GridLayout.Spec	A Spec defines the horizontal or vertical characteristics of a group of cells.
GridView	A view that shows items in two-dimensional scrolling grid.
HeaderViewListAdapter	ListAdapter used when a ListView has header views.
HorizontalScrollView	Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display.
ImageButton	Displays a button with an image (instead of text) that can be pressed or clicked by the user.
ImageSwitcher
ImageView	Displays an arbitrary image, such as an icon.
LinearLayout	A Layout that arranges its children in a single column or a single row.
LinearLayout.LayoutParams	Per-child layout information associated with ViewLinearLayout.
ListPopupWindow	A ListPopupWindow anchors itself to a host view and displays a list of choices.
ListView	A view that shows items in a vertically scrolling list.
ListView.FixedViewInfo	A class that represents a fixed view in a list, for example a header at the top or a footer at the bottom.
MediaController	A view containing controls for a MediaPlayer.
MultiAutoCompleteTextView	An editable text view, extending `AutoCompleteTextView`, that can show completion suggestions for the substring of the text where the user is typing instead of necessarily for the entire thing.
MultiAutoCompleteTextView.CommaTokenizer	This simple Tokenizer can be used for lists where the items are separated by a comma and one or more spaces.
NumberPicker	A widget that enables the user to select a number from a predefined range.
OverScroller	This class encapsulates scrolling with the ability to overshoot the bounds of a scrolling operation.
PopupMenu	A PopupMenu displays a `Menu` in a modal popup window anchored to a `View`.
PopupWindow	This class represents a popup window that can be used to display an arbitrary view.
ProgressBar	Visual indicator of progress in some operation.
QuickContactBadge	Widget used to show an image with the standard QuickContact badge and on-click behavior.
RadioButton	A radio button is a two-states button that can be either checked or unchecked.
RadioGroup	This class is used to create a multiple-exclusion scope for a set of radio buttons.
RadioGroup.LayoutParams	This set of layout parameters defaults the width and the height of the children to `WRAP_CONTENT` when they are not specified in the XML file.
RatingBar	A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars.
RelativeLayout	A Layout where the positions of the children can be described in relation to each other or to the parent.
RelativeLayout.LayoutParams	Per-child layout information associated with RelativeLayout.
RemoteViews	A class that describes a view hierarchy that can be displayed in another process.
RemoteViewsService	The service to be connected to for a remote adapter to request RemoteViews.
ResourceCursorAdapter	An easy adapter that creates views defined in an XML file.
ResourceCursorTreeAdapter	A fairly simple ExpandableListAdapter that creates views defined in an XML file.
Scroller	This class encapsulates scrolling.
ScrollView	Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display.
SearchView	A widget that provides a user interface for the user to enter a search query and submit a request to a search provider.
SeekBar	A SeekBar is an extension of ProgressBar that adds a draggable thumb.
ShareActionProvider	This is a provider for a share action.
SimpleAdapter	An easy adapter to map static data to views defined in an XML file.
SimpleCursorAdapter	An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file.
SimpleCursorTreeAdapter	An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file.
SimpleExpandableListAdapter	An easy adapter to map static data to group and child views defined in an XML file.
SlidingDrawer	This class was deprecated in API level 17. This class is not supported anymore. It is recommended you base your own implementation on the source code for the Android Open Source Project if you must use it in your application.
Space	Space is a lightweight View subclass that may be used to create gaps between components in general purpose layouts.
Spinner	A view that displays one child at a time and lets the user pick among them.
StackView
Switch	A Switch is a two-state toggle switch widget that can select between two options.
TabHost	Container for a tabbed window view.
TabHost.TabSpec	A tab has a tab indicator, content, and a tag that is used to keep track of it.
TableLayout	A layout that arranges its children into rows and columns.
TableLayout.LayoutParams	This set of layout parameters enforces the width of each child to be `MATCH_PARENT` and the height of each child to be `WRAP_CONTENT`, but only if the height is not specified.
TableRow	A layout that arranges its children horizontally.
TableRow.LayoutParams	Set of layout parameters used in table rows.
TabWidget	Displays a list of tab labels representing each page in the parent's tab collection.
TextClock	`TextClock` can display the current date and/or time as a formatted string.
TextSwitcher	Specialized `ViewSwitcher` that contains only children of type `TextView`.
TextView	Displays text to the user and optionally allows them to edit it.
TextView.SavedState	User interface state that is stored by TextView for implementing `onSaveInstanceState()`.
TimePicker	A widget for selecting the time of day, in either 24-hour or AM/PM mode.
Toast	A toast is a view containing a quick little message for the user. The toast class helps you create and show those.
ToggleButton	Displays checked/unchecked states as a button with a "light" indicator and by default accompanied with the text "ON" or "OFF".
Toolbar	A standard toolbar for use within application content.
Toolbar.LayoutParams	Layout information for child views of Toolbars.
TwoLineListItem	This class was deprecated in API level 17. This class can be implemented easily by apps using a `RelativeLayout` or a `LinearLayout`.
VideoView	Displays a video file.
ViewAnimator	Base class for a `FrameLayout` container that will perform animations when switching between its views.
ViewFlipper	Simple `ViewAnimator` that will animate between two or more views that have been added to it.
ViewSwitcher	`ViewAnimator` that switches between two views, and has a factory from which these views are created.
ZoomButton
ZoomButtonsController	The `ZoomButtonsController` handles showing and hiding the zoom controls and positioning it relative to an owner view.
ZoomControls	The `ZoomControls` class displays a simple set of controls used for zooming and provides callbacks to register for events.

Enums

ImageView.ScaleType	Options for scaling the bounds of an image to the bounds of this view.
TextView.BufferType

Exceptions

RemoteViews.ActionException Exception to send when something goes wrong executing an action